插穗类型和留叶量对莲雾扦插生根及光合参数的影响

摘要

Three types of cuttings and leaf‐retention on a cutting branch of Syzygium samarangense were applied to study their effects on the survival rate , rooting and photosynthesis of the cuttings for propagation .The intelligent monitoring and controlling of agermchit rapid propagation system was used for the experimentation .The results showed that the survival rate of the green‐colored cut branches was the highest ;while those in brown color ,the lowest .There were only minute differences between the green and the green‐brown cuttings on the number , diameter ,or length of the roots developed ,but significant differences existed between the green and the brown cuttings ,with the brown branches being the least among the three kinds of branches .The leaf‐retention on a cutting branch affected significantly the rooting and survival rate of the cuttings for propagation .The highest survival rate and rooting ratesoccurred when 2 to 4 or 3 to 4 leaveswere allowed to remain on a cutting branch .But ,none of the cuttings without any leaf survived the process .The content and fluorescence (i .e .,effective quantum yield of photosystem) of chlorophylldid not differsignificantly between the green and the green‐brown cuttings ,regardless how many leaves were allowed to remain on them .For the brown cuttings ,their chlorophyll content and yield were higher if 2 to 4 leaves were left on a cutting than other treatments .It was concluded that the green or green‐brown cutbranches with 2 to 4 or 3 to 4 leaves remained on each cutting were best for the propagation of S . samarangenseby means of cutting .%在种苗智能化快繁系统调控下，比较3种枝梢类型插穗及其不同留叶量处理对扦插成活率、生根性状、叶绿素含量及叶绿素荧光参数的影响。结果表明，3种枝梢类型中，绿色枝成活率最高，褐色枝成活率最低；在生根量、根条数、根长、根粗等生根性状上，绿色枝与绿褐枝插穗之间差异较小，与褐色枝之间差异较大；留叶量对插穗生根及成活率存在明显影响，无叶处理的插穗成活率为零，留2／4、3／4片叶处理的插穗成活率、根系性状均优于留全叶片处理；绿色枝插穗、绿褐枝插穗的不同留叶量处理间叶绿素含量、叶绿素荧光Y 值差异不显著，而褐色枝插穗以留2／4片叶处理的叶绿素含量、叶绿素荧光Y 值最大。研究表明，莲雾扦插以绿色枝插穗、绿褐枝插穗为佳，插穗留叶量以留2／4片叶或留3／4片叶为宜。